Rotary grinding stone



FIG. 1 is a perspective view of a first embodiment of a rotary grinding stone having a centrally disposed hole according to the new design.

FIG. 2 is a top view of the rotary grinding stone of FIG. 1, the bottom view being a mirror image thereof;

FIG. 3 is a right side view of the rotary grinding stone of FIG. 1, the left side view being a mirror image thereof;

FIG. 4 is a front view of the rotary grinding stone of FIG. 1, the rear view being a mirror image thereof; and,

FIG. 5 is a cross-sectional view of the rotary grinding stone of FIG. 2 taken at section 5—5. 

The ornamental design for a rotary grinding stone, as shown and described. 